3 1/2 Inch Pipe Cap – Premium Quality, Fast Delivery & OEM Solutions
For Purchasing Managers, Technical Directors & Operations Leaders who demand reliable pipe fittings at a competitive price, our 3 1/2 inch pipe caps eliminate waste, reduce downtime, and guarantee compliance.
Get Free Quote in 24 hYour Current Pipe‑Cap Challenges
- High Price. Imported caps often carry a 20‑30 % markup due to limited supply chains.
- Low Quality. Inconsistent alloy composition leads to premature corrosion and pressure‑rating failures.
- Long Lead Times. Average delivery from traditional vendors exceeds 45 days, jeopardizing project schedules.
- Regulatory Uncertainty. Missing certifications (CE, RoHS, ISO 9001) can stall customs clearance.
Why Our 3 1/2 Inch Pipe Cap Is the Smart Choice
- Factory‑Level Control. Hebei Yuanda’s 30,000 m² foundry guarantees consistent alloy mix (Carbon Steel, Stainless 304/316, or Cast Iron).
- ISO 9001 & CE Certified. Full documentation for hassle‑free export to the USA.
- OEM/ODM Design. We engineer custom thread profiles, pressure‑rating stamps, and surface finishes on demand.
- High‑Speed Delivery. 7‑10 business‑day shipping from Shijiazhuang to the West Coast via air freight.
- Cost‑Effective Pricing. Up to 25 % lower unit cost versus European suppliers, thanks to our vertical supply chain.
Technical Specifications
| Parameter | Specification |
|---|---|
| Size | 3 1/2 in (88.9 mm) OD |
| Material | Carbon Steel (ASTM A216‑WCB), Stainless 304/316, Cast Iron (EN‑GJL‑250) |
| Pressure Rating | ≤ 150 psi (10 bar) @ 25 °C |
| Tolerance | ±0.10 mm (diameter), ±0.02 mm (thread) |
| Finish | Hot‑dip galvanised, Passivation (Stainless), or Powder‑coat (custom colour) |
| Certification | CE, RoHS, ISO 9001, ASTM, API 5L |
| MOQ | 5 000 pcs (flexible for OEM projects) |
| Packaging | Wooden crate, shrink‑wrap, or bulk pallet (up to 1 ton) |
Application Scenarios & Success Stories
Our 3 1/2 inch pipe caps are deployed in:
- Water‑treatment plants – 30 % reduction in leakage incidents.
- Oil & gas pipelines – Certified for 150 psi service, meeting API standards.
- Industrial HVAC systems – Corrosion‑resistant stainless variants extend service life by 5 years.
Trusted By Leading Enterprises
“Switching to YD’s 3 1/2 inch pipe caps cut our procurement cost by 22 % and eliminated the 6‑week delay we faced with previous suppliers.” – Mike L., Procurement Manager, Midwest Water Co.
Our quality system is backed by:
- CE & CCC (China Compulsory Certification)
- ISO 9001:2015
- RoHS & REACH compliance
- ASTM, API, and EN standards
Frequently Asked Questions
What is the minimum order quantity for a custom‑OEM 3 1/2 inch pipe cap?
We accept orders as low as 5 000 pcs. For larger projects we can further reduce the MOQ and provide tiered pricing.
Can you provide CE and RoHS certificates with each shipment?
Yes. All shipments include a full test report, CE Declaration of Conformity, and RoHS compliance certificate.
What are the typical lead times for air‑freight delivery to the United States?
Standard air‑freight is 7‑10 business days after payment confirmation. Express options are available within 5 days.
Do you offer a money‑back guarantee if the caps fail the pressure test?
Absolutely. We provide a 30‑day replacement guarantee for any product that does not meet the agreed pressure rating.
How can I track my order once it ships?
We issue a real‑time tracking number (DHL, UPS, or FedEx) within 24 hours of dispatch. You’ll receive the link via email.
Ready to Secure Your Supply? Limited Stock Available!
Free Sample Kit – test our 3 1/2 inch pipe caps risk‑free.
Email Quote NowOr chat instantly on WhatsApp:
Phone: +86‑311‑808‑126‑83 | Email: info@ydcastings.com
All prices are FOB Shijiazhuang, EX‑WORKS. Payment terms: T/T 30 % deposit, 70 % balance before shipment.
What Our Clients Say
- Sarah K., Operations Manager, Texas Energy Ltd. – “The caps arrived in 8 days, fully certified, and saved us $12 k on the last project.”
- James P., Purchasing Director, California Water Works. – “Y‑D’s OEM service let us modify the thread pitch; the engineering team was responsive within hours.”
- Linda M., Technical Lead, Midwest Manufacturing. – “Zero defects in the first 10 000 pieces – a 37 % improvement over our previous supplier.”
About the Author
David Liu – Senior Foundry Engineer with 18 years in metal‑casting for pipe fittings. Former lead consultant for ISO 9001 implementation at three Fortune‑500 manufacturers. Regular contributor to Industrial Casting Review.
Contact: david.liu@ydcastings.com
For Purchasing Managers, Technical Directors & Operations Leaders who demand reliable pipe fittings at a competitive price, our 3 1/2 inch pipe caps eliminate waste, reduce downtime, and guarantee compliance. See how we solve
